/usr/share/doc/gnome-keyring/README.Debian is in gnome-keyring 3.28.0.2-1ubuntu1.
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Password caching
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GNOME keyring caches the passwords in memory, and when asked to, it will
store them on disk (in .gnome2/keyrings). They are encrypted with the
AES128 cipher, using a master password as key.
Login keyring
-------------
If you use GDM, and libpam-gnome-keyring is installed, the GNOME keyring
daemon is spawned directly at the time of authentication, and the
keyring named "login" is unlocked. This keyring uses the authentication
token as a master password.
Otherwise, it is launched by the session manager, and you will be asked
for a password for the "Default" keyring.
If you change your authentication password (using passwd or
gnome-control-center for example), the password for the login keyring
should be updated automatically.
SSH agent
---------
The GNOME keyring includes the functionality of the SSH agent, and it
can break some setups, especially if ssh-agent is started by hand.
You can disable it by removing the gnome-keyring-ssh element from the
startup applications.
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